My sansui home projector with built in dvd player is projecting images tinted blue. When playing a dvd with the built in player the picture colour is fine, but when watching anything connected via RGB, s-video or component the picture is really blue and unwatchable. Is my projector broken or is it fixable?
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It could be a broken connection in the computer lead for the red signal, or a fault on the projector that the red panel doesn't work any more.
To diagnose, bring up the projector's on screen display. If there's white in the menus then the problem is the cable. Replace it with a new one. If the menus are affected too then it's a projector problem. This requires the attention of a service engionner.
My first thought, based on what you said, is for you to check the resolution being sent to the projector...if it's too high,(above the projector's ability to display it) you'll get a distorted or even a blacked-out display. Also, check the settings for the program which is running the DVD. There could easily be an option set incorrectly.
If you're trying to project video, then the unit needs professional service. If you're trying to project from a computer, you may have a loose display cable, broken pins in one or both ends of the display cable, or broken conductors (wires) within the display cable. The computer sends its image information as a template of RED image components, GREEN image components and BLUE image components with the projector overlays to create the complete image with blended color values. (The computer also sends HORIZONTAL and VERTICAL synchronization signals, but those don'e affect the color content of the projected image.) That's why I'm suspicious of the display cable, conductors or pins.
Check the green signal lead - if one of the RGB leads doesn't make good contact, the picture will take on an odd tint that doesn't always look like it's missing one of those colours. For some reason, the green is always the most common one to fail.
A great deal of the time DVD players are very restrictive on outputting to multiple sources due to copyright protection. In my experience, if you use your laptops function keys to toggle output (For example, on my laptop, I hit FUNCTION + F4 to cycle between LCD,LCD+VGA,VGA), you should be able to disable the laptop's LCD display, only outputting via the VGA cable. It's worked for me with my HP VP6111 and Windows XP in the past.
Hope this helps!